Thomas epmtjjstd holmes



T. E, HOLMES.

STEAM HYDRAULIC INTENSIFER.

APPLICATION FILED APR4 24,1919.

Fateutd 0m. 21, 1919.

D @w @nl Mm 5 y wm M w l T Henares, a VBritain and UNITED sTATns PATENTonirica.

'rHoivrAs` iemvinlvnv HOLMES, or GLASGOW, SCOTLAND.

Specification of Letters Patent.

Application filed April 24, 1919. Serial No 292,482.,

To all whom, t may-.concerne Be itrknovvn that .I, THOMAS EDMUNDsubject.V el the King lof Great y Ireland, and a resident of Glasgow,Scotland, have inventedeertain new andV useful Improvements inSteam-,Hy-l draulic Intensiiiers, of which the following isthespecification. A l/Vhen steamfliydraulicV intensifier-operated forgingpresses andthe like aroused for rapidly repeated short-strokeoperations, the piston of the steam cylinder gradf ually lWorlrsvtowardthe outer end of its stroke,l that is` to say, it does not return to theinner end of the stroke between each successive movement. This leads togreat waste of steam. A

The invention has for its object to obviate this disability and toreduce the consumption of steam to a .minimum by the provision of meansfor insuring the definite return ot the `piston* after eachoutwardstroke.

' According to the invention there isV provided betiveenthe.usuallioatinglever-or hunting gear (conjointlyoperated `l'ronithe movingpiston of the intensifier and the controlling hand-lever) and the steamadmission valve Which it controls, a connection which is automaticallybroken (so disconnecting the steam from operation by the hand leverthrough the hunting gear) when the hunting gear overruns the valve, andis automatically restablished when the intensiiier piston returns to thecommencement of its stroke. `Thus the piston having performed a stroke,must of necessity be returned to its starting position before theconnection to the steam valve is reestablished Vso that a fresh strokemay be made.

The means for performing these functions may consist, for example, of adetent normally engaged by the hunting gear controlled yvalve-operatinglever and making connection betvveenthat lever and the valve, but whichdetent` is so vcontrolled by a Weight, spring, or equivalent, that uponthe lever moving to .free itself, Vthe detent is Withd avvn A seconddevice operated from the moving piston so controls the detent againstthe action of the Weight, springhor equivalent, that the detent 1srei-Engaged with the valve operating lever upon return of the `piston tothe beginning of its stroke.

It is obvious that the Vcarrying out of the invention as regardsstructural details may be very Widely varied. Y An example purelyengaging two tappets H2, H2, on

to 1t as to illustrative, and in no wise llimitati-ve isA shovvn asapplied to a .normal type of intensifier valve gear in eleva-tionen anaecompanylng sheet of explanatory drawings.

In thisfnormal valvegear the spindles A1, BP01: the steam and exhaustvalvesV A, B, are connected by links with a rocking lever fulcrumed on apin C1 onthe intensiier fra-mino'. An arm C2011 this rocking lever isconnected by a link `l).1 with a Heating lever D, one end of whichispivoted on a bell-crank lever E pivoted -on the framing, while theother end is operatively connected With likey bell-crank lever G. Thebellcrank lever G is connected by a link G1 with the usual hand leverG2. The' bellfcrank lever E is connected by afli-nk El with anotherbell-crank lever E2 mounted on the framing and having anarm carrying aroller Eengaged by an inc-lined bar E4 moving with the pistoni-od E55 ofthe intensifier. The roller 4 3*is held in engagement with `the inclinedbar bya Weight EG, and the Whole forms the usual hunting gear.

The valve H, J, controlling the steam supply to the usual steam operateddevice for maneuvering the press-head or equivalent are controlled by atappet lever H1 moving With the hand lever G2 and alternatively afrod H4guided in the framing nected at its other end. to a bell-crank lever J1,connected by a link J2 toV a rocking lever J3, counterbalanced by aWeight J* and connected by links J2 to the valves H, J.

According to this example of the carrying out of the invention, insteadof the steam admission valve A being connected by a simple link directlyto the rocking lever C as is usually the case, there is pivoted on thespindie A1 of the steam-valve a detent leverK having a part K1 adaptedto be engaged by a pin C3 on the rocking lever C which lever has on itsopposite end a pin C* engaging av slot (so as to provide a certainamount of lost motion?) in the link B2, connecting the exhaust valve BWith that lever. The detent lever vK has a Weight K2 so applied tend tothrow the detent part K1 out oi' engagement With the pin C3 and also hasan arm on Which is a pin K2 engaging a' lost motion slot in a link L1necting it to a lever L pivoted on the framing and which is connected byasecond link L2 With a Weight constrained bell-crank lever M connectedin turn by a link M1 through Patented Qct. 21, 1919.

coni dia'tely the weight K2 Y turns to such a ,an upward pressureagainst it,

a lost motion pin-and-slot device M2 with a lever N fast on the samespindle as that lever' E on which is pivoted one end of the floatinglever D. f

Normally the weight K2 tends tO-keep'the' detent Klrvof the lever K outof engagement with the pin C3, but the detent K1 is of such a shape thatso it is held in engagement. This upward pressure subsists' so long 'asthe hunting-gear does not overrun the valve, but'if it' does, thenimme-V K1 freeing the steam valve A which thereupon closes.- In order toget steam the o erator must now return the hand-lever to the beginningof its stroke." When he approaches this point the steam piston reLposition and with it the inclin'edrbar E* that the roller E3 has takenup thelost motion of the devices K3 M2, and" urged Vby itsV weight Eforces the d e tent K1 back into engagement with the pin CS.- Theoperator then again attains control of steam. f

That I claim is l. ln valvegear for steam hydraulic intensiiiers, afloating-lever or hunting-gear device controlling the steamadmission'and exhaust valves, in combination with a connection betweensaid device and the admis- Gopies of this patent may berobtained forlong as the pin lG3 exertsY withdraws the detentv five cents each, byaddressing the Washington, D. C.

A sion valve,' means for automatically breakthe huntinggear ing theconnection when for automatic ally over-runs v'the valve7 and lrestablishingv the connection when the steam piston returns to thebeginning of its stroke.

2. The valve gear device forming theV subject matter of claim 1 hereof,comprising a detent normally engaged by the huntinggear-controlledvalve-operating lever,V making connection betweenthat lever and' thevalve', a weight for controlling the'detent, the detent being withdrawnwhen the lever moves to free itself, and devices operating from themoving Vsteam piston to vrengage the detent when the piston returns tothe beginning of its stroke.

3. The valve gear device forming the subject matter of Vclaim lhereof,comprising a detent lever pivoted on the steam valve spindle and havingapart adapted to be engaged by the Yco-ac't'ing valVebperating` leverand so shaped that they normally hold one another in engagement, meanstending to throw them out of engagement, and-means operated by themoving, piston to reestablish said engagement only nearth'e beginningofthe piston stroke.

In testimony whereof I have signed my name to this specification.

THOMAS EDMUND HOLMES.

Commissioner of Patents,

